Double diaphragm pump



FIG. 1 is a front elevation view of the double diaphragm pump;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side elevation view thereof and is a mirror image of the right side;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a back perspective view thereof. 

The ornamental design for the double diaphragm pump, as shown and described. 